Sensor module and weight exercise apparatus including the same

A weight exercise apparatus comprising:

• an exercise main body comprising a plurality of weight plates which are movable;
• a sensor module configured to detect movement of a weight plate of the plurality of weight plates;
• a user interface unit configured to output a user interface screen;
• a memory storing at least one instruction;
• and
• a processor configured to control the user interface unit to display a user interface element indicating an exercise state of a user corresponding to the movement on the user interface screen, by executing the at least one instruction,
• wherein the sensor module comprises a single laser sensor, the single laser sensor comprising:
• a first sensing mode in which a laser beam is irradiated toward the weight plate or a component moving together with the weight plate to detect a first distance of the weight plate when the weight plate moves;
• and
• a second sensing mode in which a laser beam is irradiated toward a component that does not move in spite of movement of the weight plate when the weight plate moves, measure a first reference distance between the component that does not move and the single laser sensor at a first time point, and measure a second distance between the component that does not move and the single laser sensor at a second time point that is different from the first time point, and
• wherein the processor is further configured to, by executing the at least one instruction, compensate a measurement error in the first distance detected by the first sensing mode caused by surrounding environmental conditions based on an amount of change or a change rate between the first reference distance and the second distance.